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Enhanced Magnetotransport Properties of Ag-doped La0.7Ca0.3-xAgxMnO3 Polycrystalline Ceramics

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Abstract

The present report focuses on the successful synthesis of La0.7Ca0.3−xAgxMnO3 (x = 0, 0.10, 0.15, 0.20, and 0.30) polycrystalline manganite samples through a soft chemical polymeric precursor route and subsequent impact of Ag doping and grain size on their magnetotransport features. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses reveal that Ag doping leads to a phase transformation from the orthorhombic phase to the rhombohedral phase (for x ≥ 15%). Furthermore, it shows that the insulator–metal transition temperature (TIM) and paramagnetic–ferromagnetic (PM-FM) transition temperature (TC) increase with Ag doping concentration and also with the sintering temperature. The prime factors leading to the enhancement with Ag doping are the well-known oxygenation effect by metallic Ag, which helps to improve the transport properties of La1−xCaxMnO3 (LCMO) manganite, and the increase in the tolerance factor (τ), which in turn leads to the Mn-O-Mn bond angle and the structural disorder near the grain boundaries that weaken the double exchange. The room temperature magnetoresistance values are found to be higher for Ag-doped LCMO samples than for the pristine LCMO. The enhanced ferromagnetic ordering temperature along with low-field magnetoresistance (LFMR) of the as-synthesized Ag-doped LCMO polycrystalline ceramic indicate its potential for device fabrication.

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Acknowledgments

The authors are thankful to the Nanoscience Lab, Department of Physics, BHU-Varanasi, for access to various characterization/measurement facilities employed in the present study. Moreover, the authors express their gratitude to Dr H K Singh and P K Siwach (CSIR- National Physical Laboratory, New Delhi) for their support through discussion on various issues concerning the results.

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Authors and Affiliations

  1. Department of Physics, Banaras Hindu University, Varanasi, 221005, India

    Pankaj Srivastava

  2. Department of Physics, Deshbandhu College, University of Delhi, New Delhi, 110019, India

    Ashwani Kumar Singh & Udai Prakash Tyagi

  3. Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilaspur, 495009, India

    Jai Singh

  4. Department of Physics, TDPG College, VBS Purvanchal University, Jaunpur, 222001, India

    Amit Srivastava

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  1. Pankaj Srivastava
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Contributions

PS; Conceptualization, Methodology, Investigation, writing, AKS; Methodology, Investigation, writing, JS; Investigation, Analyzing the data, AS; Conceptualization, Supervision, Writing & Editing. UPT: Review, Revision and Editing.

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Correspondence to Jai Singh or Amit Srivastava.

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Srivastava, P., Singh, A.K., Tyagi, U.P. et al. Enhanced Magnetotransport Properties of Ag-doped La0.7Ca0.3-xAgxMnO3 Polycrystalline Ceramics. J. Electron. Mater. 52, 6425–6435 (2023). https://doi.org/10.1007/s11664-023-10595-4

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